Edge Punching Shear of Waffle Slab with Moment Transfer Perpendicular to Slab’s Free Edge

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Title: Edge Punching Shear of Waffle Slab with Moment Transfer Perpendicular to Slab’s Free Edge

Author(s): Ahmed Faleh Al-Bayati, Teck Leong Lau, and Leslie A. Clark

Publication: Structural Journal

Volume: 116

Issue: 4

Appears on pages(s): 243-252

Keywords: design; edge punching shear; moment transfer; plasticity; reinforced concrete; waffle slab

DOI: 10.14359/51715630

Date: 7/1/2019

Abstract:
This paper presents test results of six one-tenth-scale micro-concrete waffle slabs subjected to edge punching shear in the presence of moment transfer perpendicular to the slab’s free edge. Although the observed punching failure mechanism of a waffle slab was found to be very similar to that of a flat slab; the shear capacity is reduced relatively because some of the potential failure surface is lost when it extends into the waffle section. Because the current codes of practice do not consider the punching shear mechanism of waffle slabs, comparisons with test results revealed that ACI 318-14, BS 8110, and Eurocode 2 overestimated the punching capacities of waffle slabs. An upper-bound plasticity theory model was proposed to predict the punching shear failure load, which gave good agreement with the tests. The proposed model assumes the concrete to be rigid perfectly plastic with the modified Mohr-Coulomb as failure criterion.

Related References:

1. Regan, P. E., and Braestrup, M. W., “Punching Shear in Reinforced Concrete: A State-of-the-Art Report,” Bulletin d’Information, No. 168, Comité Euro-International du Béton, Lausanne, 1985, 232 pp.

2. Magura, D. D., and Corley, W. G., “Tests to Destruction of a Multipanel Waffle Slab Structure—1964-1965 New York World’s Fair,” ACI Journal Proceedings, V. 68, No. 9, Sept. 1971, pp. 699-703.

3. Xiang, X. Z., “Punching Shear Strength of Waffle Slabs at Internal Columns,” PhD dissertation, University of Leeds, Leeds, UK, 1993.

4. Hussein, A. F., “Punching Shear Strength at Edge Columns in Ribbed Flat Slabs,” PhD dissertation, University of Leeds, Leeds, UK, 1994.

5. Mosalam, K. M., and Naito, C. J., “Seismic Evaluation of Gravity-Load-Designed Column-Grid System,” Journal of Structural Engineering, ASCE, V. 128, No. 2, 2002, pp. 160-168. doi: 10.1061/(ASCE)0733-9445(2002)128:2(160)

6. Benavent-Climent, A.; Cahis, X.; and Catalan, A., “Seismic Behavior of Interior Connections in Existing Waffle-Flat-Plate Structures,” Engineering Structures, V. 30, No. 9, 2008, pp. 2510-2516. doi: 10.1016/j.engstruct.2008.02.004

7. Souza, S. S. M., and Oliveira, D. R. C., “Reinforced Concrete Waffle Flat Slabs under Shearing,” IBRACON Structures and Materials Journal, V. 4, No. 4, 2011, pp. 610-625.

8. ACI Committee 318, “Building Code Requirements for Reinforced Concrete (ACI 318-14) and Commentary (ACI 318R-14),” American Concrete Institute, Farmington Hills, MI, 2014, 519 pp.

9. Eurocode 2, “Design of Concrete Structures—Part 1-1: General Rules and Rules for Buildings,” CEN, EN 1992-1-1, Brussels, Belgium, 2004, 225 pp.

10. British Standards Institution, 1997, “Structural Use of Concrete: Part 1, Code of Practice for Design and Construction, (BS 8110: Part 1: 1997),” London, 120 pp.

11. Al-Bayati, A. F.; Lau, T. L.; and Clark, L. A., “Concentric Punching Shear of Waffle Slab,” ACI Structural Journal, V. 112, No. 5, Sept-Oct. 2015, pp. 533-542. doi: 10.14359/51687906

12. Al-Bayati, A. F.; Lau, T. L.; and Clark, L. A., “Eccentric Punching Shear of Waffle Slab,” ACI Structural Journal, V. 115, No. 1, Jan. 2018, pp. 163-173. doi: 10.14359/51701090

13. Binici, B., and Bayrak, O., “Upgrading of Slab-Column Connections Using Fiber Reinforced Polymers,” Engineering Structures, V. 27, No. 1, 2005, pp. 97-107. doi: 10.1016/j.engstruct.2004.09.005

14. Johnson, R. P., “Strength Tests on Scaled Down Concrete Suitable for Models with a Note on Mix Design,” Magazine of Concrete Research, V. 14, No. 40, 1962, pp. 47-53. doi: 10.1680/macr.1962.14.40.47

15. Endersbee, L. A., “Discussion of William, A.L., and Mario, P., “Size Effects in small-scale Models,” ACI Journal Proceedings, V. 63, No. 11, 1966, pp. 1572-1573.

16. Joint ACI-ASCE Committee 421, “Guide to Shear Reinforcement for Slabs (ACI 421.1R-08),” American Concrete Institute, Farmington Hills, MI, 2008, 15 pp.

17. Regan, P. E.; Walker, P. R.; and Zakaria, K. A. A., “Tests of Reinforced Concrete Flat Slabs,” CIRIA Project RP 220, School of the Environment Polytechnic of Central London, London, UK, 1979, 217 pp.

18. Gardner, N. J., and Shao, X.-Y., “Punching Shear of Continuous Flat Reinforced Concrete Slabs,” ACI Structural Journal, V. 93, No. 2, Mar.-Apr. 1996, pp. 218-228.

19. Sudarsana, I. K., “Punching Shear in Edge and Corner Column Slab Connections of Flat Plate Structures,” PhD dissertation, University of Ottawa, Ottawa, ON, Canada, 2001.

20. Kane, K. A., “Some Model Tests on the Punching Action of Reinforced Concrete Slabs at Edge Columns,” honours project, The Queen’s University of Belfast, Belfast, UK, 1978.

21. Regan, P. E., “Behaviour of Reinforced Concrete Flat Slabs,” CIRIA Report 89, Construction Industry Research and Information Association, London, UK, 1981, 89 pp.

22. Al-Bayati, A. F., “Punching Shear Mechanisms of Waffle Slabs,” PhD dissertation, University of Nottingham Malaysia, Semenyih, Malaysia, 2013.

23. Marzouk, H., and Hussein, A., “Experimental Investigation on the Behavior of High-Strength Concrete Slabs,” ACI Structural Journal, V. 88, No. 6, Nov.-Dec. 1991, pp. 701-713.

24. Braestrup, M. W.; Nielsen, M. P.; Jensen, B. C.; and Bach, F., 1976, “Axisymmetric Punching and Reinforced Concrete,” Report No. R-75, Structural Research Laboratory, Technical University of Denmark, Lyngby, Denmark, 33 pp.

25. Salim, W., and Sebastian, W. M., “Plasticity Model for Predicting Punching Shear Strengths of Reinforced Concrete Slabs,” ACI Structural Journal, V. 99, No. 6, Nov.-Dec. 2002, pp. 827-835.

26. Lau, T. L., and Clark, L. A., “Shear Transfer between Ribbed Slab and Internal Column,” Magazine of Concrete Research, V. 59, No. 7, 2007, pp. 507-516. doi: 10.1680/macr.2007.59.7.507

27. Lau, T. L., and Clark, L. A., “Shear Transfer between Ribbed Slab and Edge Column,” Magazine of Concrete Research, V. 60, No. 6, 2008, pp. 411-419. doi: 10.1680/macr.2008.60.6.411

28. Nielsen, M. P.; Brsestrup, M. W.; Jensen, B. C.; and Bach, F., “Concrete Plasticity-Beam Shear-Shear in Joints-Punching shear,” Special publication, Danish Society for Structural Science and Engineering, Structural Research Laboratory, Technical University of Denmark, Lyngby, Denmark, 1978, 129 pp.

29. Wight, J. K., Limit Analysis and Concrete Plasticity, third edition, CRC Press, Boca Raton, FL, 2011, 799 pp.

30. Sigurdsson, T. G., “Punching Shear by Eccentric Loading,” MSc dissertation, Technical University of Denmark, Kongens, Lyngby, Denmark, 1991. (in Danish).

31. Boswell, L. F., and Wong, S. S., “The Shear Behaviour of Micro-Concrete and Its Inclusion in a Proposed Yield Criterion,” Proceedings of Cement and Concrete Association Research Seminar, Wexham Springs, UK, 1981.

32. Wong, S. S., “Collapse Behaviour of Micro-Concrete Box Girders Bridges,” PhD thesis, City University, London, UK, 1998.

33. Mattock, A. H.; Ibrahim, I. O.; and Hofbeck, J. A., “Shear Transfer in Reinforced Concrete,” ACI Journal Proceedings, V. 66, No. 2, Feb. 1969, pp. 119-128.

34. Clark, L. A., “Concrete Bridge Design to BS 5400,” Construction Press, London and New York, 1983,186 pp.

35. Simmonds, S. H., and Alexander, S. D. B., “Truss Model for Edge Column-Slab Connections,” ACI Structural Journal, V. 84, No. 4, July-Aug. 1987, pp. 296-303.

36. Dilger, W. H., and Ghali, A., “(Discussion of) “Proposed Revisions to: Building Code Requirements for Reinforced Concrete,” ACI Structural Journal, V. 86, No. 5, Sept.-Oct. 1989, pp. 326-329.

37. Hawkins, N. M., and Corley, W. G., “Transfer of Unbalanced Moment and Shear from Flat Plates to Columns,” ACI Journal Proceedings, V. 69, No. 1, 1972, pp. 147-176.

38. Park, H. G., and Choi, K. K., “Strength of Exterior Slab-Column Connections Subjected to Unbalanced Moments,” Engineering Structures, V. 29, No. 6, 2007, pp. 1096-1114. doi: 10.1016/j.engstruct.2006.08.001

39. Lau, T. L., “Shear Transfer Mechanism between Reinforced Concrete Ribbed Slabs and Column,” PhD dissertation, University of Birmingham, Birmingham, UK, 2005.


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